Trademarked material in novel, cross-referenced (6)
I believe the answer is:
velcro
'trademarked material' is the definition.
'in novel cross-referenced' is the wordplay.
'in' indicates a hidden word.
'VELCRO' is hidden within 'novel cross referenced'.
(Other definitions for velcro that I've seen before include "Fastener for clothes with two strips pressed together" , "secure bond" , "Clothes fastener of two pieces of cloth that stick" , "Fastening tape" , "Modern cloth fastener with two strips pressed together" .)